Solution
Solutions for global temperature control systems
Semiconductor Equipment
subcategory： Solution
2024-09-12
1. Application background
Heating belt systems are widely used in the technology industry. For example, soft heating cloth packs are needed to maintain the temperature in vacuum and gas pipelines used in various technology industries. Once the heating is out of control, the over-temperature protection function needs to be activated when the heating belt is heating up continuously, and the heating power supply is cut off. Therefore, as the key device of over-temperature protection, the temperature switch plays a vital role in the heating belt system.
2. Protection principle
· The temperature switch is a mechanical passive component, which is often set in the main circuit in the heating belt system. When the circuit fails or the current exceeds the rated value, the abnormal heating of the circuit causes the temperature to rise. The temperature switch senses the external temperature change through the internal heat sensitive element bimetal. Once the temperature exceeds the set threshold, the two pieces will deform and disconnect Contact, cut off the circuit, so as to protect the whole machine.
When the heat-sensitive element acts, the contact is disconnected, and the contact resistance changes from within 50mΩ to near infinity instantly, turning off the main circuit current, thereby protecting the whole machine.
When the ambient temperature drops to the reset temperature of the temperature switch, the heat sensitive element returns to the initial state, the contact is closed again, and the resistance signal within 50mΩ is given to the circuit, and the actuator operates according to the program setting.
3. Installation position
The temperature switch is installed in the heating layer of the heating belt system, and is often placed close to the laying position of the heating line or the position where the heating temperature can be felt quickly, so as to monitor the temperature change in time.
4. Selection factors
· Rated current and voltage: Ensure that the rated current and voltage of the selected temperature switch meet the working current and voltage requirements of the heating belt to ensure normal operation.
· Protection temperature: according to the design and installation location of different temperatures, usually 120 ℃, 150 ℃, 200 ℃ these three temperature levels.
· Contact switch form: it is divided into two types: normally closed and normally open. Normally closed is the initial state of contact closure, and the temperature protection contact is disconnected. It is always the opposite. Different switch forms are selected according to the design.
· Size and installation method: Select the appropriate size and installation method of the thermal protector according to the size and installation space of the heating belt to ensure that the installation is convenient and does not affect the normal operation of the equipment.
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